code: def test_permutation_soundness(self):
      assert (numpy.sort(self.a) == numpy.arange(self.num)).all()
  
imports: import unittest
  import numpy
  import pytest
  import cupy
  from cupy import testing
  from cupy.testing import _condition
label_desc: Use image node_id 2 for calling the TestPermutationSoundness obj's underlying member method code with example usage: obj.test_permutation_soundness() without return types